#define  _CRT_SECURE_NO_WARNINGS  1
#include <stdio.h>
int main()
{
	int x, y;
	int count = 0;
	scanf("%d %d", &x, &y);
	for (int i = 0; i < 32; i++)
	{
		if (((x >> i) & 1) != ((y >> i) & 1))
		{
			count++;
		}
	}
	printf("%d", count);

	return 0;
}